S3E18 - more poison than tea

Date: 4th of Seleszeni 1076 ZC Is it the morning of the Spring Harvest Festival in the Third District. The ball is the 6th.   The city is livelier than usual because of the festival. It was a good harvest so far this year, so they expect a lot of loan forgiveness from the Orzhov. Jace sends us a Sending in the morning. He sends it to Theo, who senses it before it arrives thanks to her occlumency training.
Niv-Mizit has found much info about Valtara and how the guild magic works. Niv-Mizit doesn't think that Nicol Bolas can get into Ravnica through the pocket dimension.
  The party gets dressed a little nicer for the festival.   Androz is the first one down, who meets Montague. He decides to try his luck with some poker to win some money before enjoying the festival. He shares war stories with them to get them to feel more comfy. He wins 26gp.
  Theo gets flower crowns for the party.
  We head to the square to check out how everything is set up for the day. There are Azorius and Boros security out and about in higher numbers because of our tip.
We recognize Miss Poppy, the apothecary shopkeeper, who has set up a booth in the square.
  Dream uses Detect Magic in the square, and notices the absence of wards around the main stage.   The plan: convince Commander Seraphina Lightblade to let us have some invisible people in front of Arbiter Thaddeus Kavin to act as unseen shields. Then Androz and Theo can hang out in the building where we expect the assassin to be. The Duke can watch from in the Square.   We approach Seraphina in the morning. She is distraught and mid-conversation. Androz eavesdrops and hears that she is discussing a member of the Azorius who has gone missing (Sgt. Marcus Thorne). One of Kavin's posse. He left on an early patrol and that was the last anyone has seen of him. We tell her the plan. We convince her to leave the roofs open so that we can catch the terrorist.   Dream, Androz, and The Duke go investigating the missing Sergeant. He never checked in for his shift. The Azorius Peace Keepers working here don't have any idea that there may be magic users trying to disguise themselves as him. Dream and the Duke say to arrest him if he shows up late.
  Terri and Theo are keeping an eye on the Square:
Brew Garden. Gumbo Competition. Street Vendor Maze. Main Stage. Carnival Game Area. Secondary Stage. Mask Making Workshop. Puppet Show Stage. Pie Eating Contest Stage. Orzhov Blessings Booth. Fortune Teller Tent. Artist Alley.   Terri is able to find some poisonous flowers to craft with later.   We catch the trail of a blonde human in an oversized Azorius uniform. Dream finds Sgt. Marcus Thorne unconscious and tied up in a dumpster. He seems to be drugged and safe, so she leaves him there.   The Duke has tea with Arbiter Kavin, and The Duke fills him in about why they're in town and the assassination attempt. As they're drinking the tea, they both fail con saves and drop to 0 HP. Terri rushes in and gives the Arbiter a healing potion. The Duke rolls well and stabilizes. Terri tests the poison and IDs it as an ingestible poison. It's potent and foreign. He keeps some extra in a waterskin.   Dream tells the Azorius about the attack and the disguise, so now they're on alert. They are caught before the second assassination attempt.   We all catch an invite to the ball as part of his gratitude.   Kavin's speech focuses on critiquing Garrock. "The Badlands don't want freedom. They want power."